feat: add init_early for first stage init

1）增加init_early完成第一阶段初始化：完成初始文件系统挂载，完成基础的dev节点创建，完成required fs的挂载
2）second stage过程的init去掉第一阶段相关代码，解除仅能静态链接的限制。
Signed-off-by: Nhandyohos <zhangxiaotian@huawei.com>
Change-Id: I1b981a5d74171852fccd2f9980605f0eea5abb6b

#I5ACWF

interfaces/innerkits/BUILD.gn

@@ -251,6 +251,11 @@ if (defined(ohos_lite)) {
   }
 
   # For init only
+  config("libfsmanager_exported_configs") {
+    visibility = [ ":*" ]
+    include_dirs =
+        [ "//base/startup/init_lite/interfaces/innerkits/include/fs_manager" ]
+  }
   ohos_static_library("libfsmanager_static") {
     sources = fs_manager_sources
     include_dirs = [
@@ -260,6 +265,8 @@ if (defined(ohos_lite)) {
       "//base/startup/init_lite/services/include",
       "//base/startup/init_lite/services/param/include",
     ]
+    public_configs = [ ":libfsmanager_exported_configs" ]
+    deps = [ "//base/startup/init_lite/services/log:init_log" ]
 
     part_name = "init"
   }

services/BUILD.gn

@@ -115,6 +115,32 @@ if (defined(ohos_lite)) {
   import("//build/ohos.gni")
   import("//build/ohos/native_stub/native_stub.gni")
 
+  ohos_executable("init_early") {
+    sources = [
+      "init/standard/device.c",
+      "init/standard/init_mount.c",
+      "init/standard/main_early.c",
+      "init/standard/switch_root.c",
+    ]
+    include_dirs = [
+      "//base/startup/init_lite/services/include",
+      "//base/startup/init_lite/services/init/include",
+    ]
+    deps = [
+      "//base/startup/init_lite/interfaces/innerkits:libfsmanager_static",
+      "//base/startup/init_lite/services/log:init_log",
+      "//base/startup/init_lite/ueventd:libueventd_ramdisk_static",
+      "//third_party/bounds_checking_function:libsec_static",
+      "//third_party/cJSON:cjson_static",
+    ]
+    install_images = [
+      "updater",
+      "ramdisk",
+    ]
+    install_enable = true
+    part_name = "init"
+  }
+
   ohos_executable("init") {
     sources = [
       "//base/startup/init_lite/interfaces/innerkits/fd_holder/fd_holder_internal.c",
@@ -126,11 +152,9 @@ if (defined(ohos_lite)) {
       "init/standard/init_cmds.c",
       "init/standard/init_control_fd_service.c",
       "init/standard/init_jobs.c",
-      "init/standard/init_mount.c",
       "init/standard/init_reboot.c",
       "init/standard/init_service.c",
       "init/standard/init_signal_handler.c",
-      "init/standard/switch_root.c",
     ]
 
     modulemgr_sources = [
@@ -155,7 +179,6 @@ if (defined(ohos_lite)) {
       "//base/startup/init_lite/services/loopevent/include",
       "//base/startup/init_lite/interfaces/innerkits/include",
       "//base/startup/init_lite/interfaces/innerkits/fd_holder",
-      "//base/startup/init_lite/ueventd/include",
       "//third_party/cJSON",
       "//third_party/bounds_checking_function/include",
       "//base/startup/init_lite/interfaces/innerkits/control_fd",
@@ -172,7 +195,6 @@ if (defined(ohos_lite)) {
       "//base/startup/init_lite/services/param:param_init",
       "//base/startup/init_lite/services/utils:libinit_tools",
       "//base/startup/init_lite/services/utils:libinit_utils",
-      "//base/startup/init_lite/ueventd:libueventd_ramdisk_static",
       "//third_party/bounds_checking_function:libsec_static",
       "//third_party/cJSON:cjson_static",
     ]
@@ -235,7 +257,6 @@ if (defined(ohos_lite)) {
     install_images = [
       "system",
       "updater",
-      "ramdisk",
     ]
     install_enable = true
     part_name = "init"
@@ -244,6 +265,7 @@ if (defined(ohos_lite)) {
   group("startup_init") {
     deps = [
       ":init",
+      ":init_early",
       "etc:etc_files",
       "//base/startup/init_lite/services/param:param_client",
       "//base/startup/init_lite/services/param:param_init",

services/init/standard/init.c

@@ -28,7 +28,6 @@
 #include "config_policy_utils.h"
 #include "device.h"
 #include "fd_holder_service.h"
-#include "fs_manager/fs_manager.h"
 #include "init_control_fd_service.h"
 #include "init_log.h"
 #include "init_mount.h"
@@ -38,9 +37,6 @@
 #include "init_service_manager.h"
 #include "init_utils.h"
 #include "securec.h"
-#include "switch_root.h"
-#include "ueventd.h"
-#include "ueventd_socket.h"
 #include "fd_holder_internal.h"
 #include "sandbox.h"
 #include "sandbox_namespace.h"
@@ -110,20 +106,6 @@ void SystemInit(void)
     InitControlFd();
 }
 
-static void EnableDevKmsg(void)
-{
-    /* printk_devkmsg default value is ratelimit, We need to set "on" and remove the restrictions */
-    int fd = open("/proc/sys/kernel/printk_devkmsg", O_WRONLY | O_CLOEXEC, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
-    if (fd < 0) {
-        return;
-    }
-    char *kmsgStatus = "on";
-    write(fd, kmsgStatus, strlen(kmsgStatus) + 1);
-    close(fd);
-    fd = -1;
-    return;
-}
-
 void LogInit(void)
 {
     int ret = mknod("/dev/kmsg", S_IFCHR | S_IWUSR | S_IRUSR,
@@ -133,105 +115,9 @@ void LogInit(void)
     }
 }
 
-static char **GetRequiredDevices(Fstab fstab, int *requiredNum)
-{
-    int num = 0;
-    FstabItem *item = fstab.head;
-    while (item != NULL) {
-        if (FM_MANAGER_REQUIRED_ENABLED(item->fsManagerFlags)) {
-            num++;
-        }
-        item = item->next;
-    }
-    char **devices = (char **)calloc(num, sizeof(char *));
-    INIT_ERROR_CHECK(devices != NULL, return NULL, "Failed calloc err=%d", errno);
-
-    int i = 0;
-    item = fstab.head;
-    while (item != NULL) {
-        if (FM_MANAGER_REQUIRED_ENABLED(item->fsManagerFlags)) {
-            devices[i] = strdup(item->deviceName);
-            INIT_ERROR_CHECK(devices[i] != NULL, FreeStringVector(devices, num); return NULL,
-                "Failed strdup err=%d", errno);
-            i++;
-        }
-        item = item->next;
-    }
-    *requiredNum = num;
-    return devices;
-}
-
-static int StartUeventd(char **requiredDevices, int num)
-{
-    INIT_ERROR_CHECK(requiredDevices != NULL && num > 0, return -1, "Failed parameters");
-    int ueventSockFd = UeventdSocketInit();
-    if (ueventSockFd < 0) {
-        INIT_LOGE("Failed to create uevent socket");
-        return -1;
-    }
-    RetriggerUevent(ueventSockFd, requiredDevices, num);
-    close(ueventSockFd);
-    return 0;
-}
-
-static void StartInitSecondStage(void)
-{
-    int requiredNum = 0;
-    Fstab* fstab = LoadRequiredFstab();
-    INIT_ERROR_CHECK(fstab != NULL, abort(), "Failed to load required fstab");
-    char **devices = GetRequiredDevices(*fstab, &requiredNum);
-    if (devices != NULL && requiredNum > 0) {
-        int ret = StartUeventd(devices, requiredNum);
-        if (ret == 0) {
-            ret = MountRequriedPartitions(fstab);
-        }
-        FreeStringVector(devices, requiredNum);
-        devices = NULL;
-        ReleaseFstab(fstab);
-        fstab = NULL;
-        if (ret < 0) {
-            // If mount required partitions failure.
-            // There is no necessary to continue.
-            // Just abort
-            INIT_LOGE("Mount requried partitions failed; please check fstab file");
-            // Execute sh for debugging
-            execv("/bin/sh", NULL);
-            abort();
-        }
-    }
-
-    // It will panic if close stdio before execv("/bin/sh", NULL)
-    CloseStdio();
-
-#ifndef DISABLE_INIT_TWO_STAGES
-    SwitchRoot("/usr");
-    // Execute init second stage
-    char * const args[] = {
-        "/bin/init",
-        "--second-stage",
-        NULL,
-    };
-    if (execv("/bin/init", args) != 0) {
-        INIT_LOGE("Failed to exec \"/bin/init\", err = %d", errno);
-        exit(-1);
-    }
-#endif
-}
-
 void SystemPrepare(void)
 {
-    MountBasicFs();
-    CreateDeviceNode();
-    LogInit();
-    // Make sure init log always output to /dev/kmsg.
-    EnableDevKmsg();
-    // Only ohos normal system support
-    // two stages of init.
-    // If we are in updater mode, only one stage of init,
-    INIT_LOGI("DISABLE_INIT_TWO_STAGES not defined");
-    if (InUpdaterMode() == 0) {
-        StartInitSecondStage();
-    }
+    // Second stage, nothing to prepare
 }
 
 void SystemLoadSelinux(void)

services/init/standard/main_early.c

+/*
+ * Copyright (c) 2020-2021 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <errno.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <time.h>
+#include <sys/sysmacros.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <linux/major.h>
+#include "device.h"
+#include "init_log.h"
+#include "init_utils.h"
+#include "init_mount.h"
+#include "fs_manager/fs_manager.h"
+#include "switch_root.h"
+#include "ueventd.h"
+#include "ueventd_socket.h"
+
+static void EnableDevKmsg(void)
+{
+    /* printk_devkmsg default value is ratelimit, We need to set "on" and remove the restrictions */
+    int fd = open("/proc/sys/kernel/printk_devkmsg", O_WRONLY | O_CLOEXEC, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+    if (fd < 0) {
+        return;
+    }
+    char *kmsgStatus = "on";
+    write(fd, kmsgStatus, strlen(kmsgStatus) + 1);
+    close(fd);
+    fd = -1;
+    return;
+}
+
+static char **GetRequiredDevices(Fstab fstab, int *requiredNum)
+{
+    int num = 0;
+    FstabItem *item = fstab.head;
+    while (item != NULL) {
+        if (FM_MANAGER_REQUIRED_ENABLED(item->fsManagerFlags)) {
+            num++;
+        }
+        item = item->next;
+    }
+    char **devices = (char **)calloc(num, sizeof(char *));
+    INIT_ERROR_CHECK(devices != NULL, return NULL, "Failed calloc err=%d", errno);
+
+    int i = 0;
+    item = fstab.head;
+    while (item != NULL) {
+        if (FM_MANAGER_REQUIRED_ENABLED(item->fsManagerFlags)) {
+            devices[i] = strdup(item->deviceName);
+            INIT_ERROR_CHECK(devices[i] != NULL, FreeStringVector(devices, num); return NULL,
+                "Failed strdup err=%d", errno);
+            i++;
+        }
+        item = item->next;
+    }
+    *requiredNum = num;
+    return devices;
+}
+
+static int StartUeventd(char **requiredDevices, int num)
+{
+    INIT_ERROR_CHECK(requiredDevices != NULL && num > 0, return -1, "Failed parameters");
+    int ueventSockFd = UeventdSocketInit();
+    if (ueventSockFd < 0) {
+        INIT_LOGE("Failed to create uevent socket");
+        return -1;
+    }
+    RetriggerUevent(ueventSockFd, requiredDevices, num);
+    close(ueventSockFd);
+    return 0;
+}
+
+static void MountRequiredPartitions(void)
+{
+    int requiredNum = 0;
+    Fstab* fstab = LoadRequiredFstab();
+    INIT_ERROR_CHECK(fstab != NULL, abort(), "Failed to load required fstab");
+    char **devices = GetRequiredDevices(*fstab, &requiredNum);
+    if (devices == NULL || requiredNum <= 0) {
+        return;
+    }
+
+    int ret = StartUeventd(devices, requiredNum);
+    if (ret == 0) {
+        ret = MountRequriedPartitions(fstab);
+    }
+    FreeStringVector(devices, requiredNum);
+    devices = NULL;
+    ReleaseFstab(fstab);
+    fstab = NULL;
+    if (ret < 0) {
+        // If mount required partitions failure.
+        // There is no necessary to continue.
+        // Just abort
+        INIT_LOGE("Mount requried partitions failed; please check fstab file");
+        // Execute sh for debugging
+        execv("/bin/sh", NULL);
+        abort();
+    }
+    SwitchRoot("/usr");
+}
+
+int main(int argc, char * const argv[])
+{
+    MountBasicFs();
+    CreateDeviceNode();
+    OpenLogDevice();
+    // Make sure init log always output to /dev/kmsg.
+    EnableDevKmsg();
+
+    if (InUpdaterMode() == 0) {
+        MountRequiredPartitions();
+    }
+
+    // Execute init second stage
+    char * const args[] = {
+        "/bin/init",
+        "--second-stage",
+        NULL,
+    };
+    if (execv("/bin/init", args) != 0) {
+        INIT_LOGE("Failed to exec \"/bin/init\", err = %d", errno);
+        exit(-1);
+    }
+    return 0;
+}

services/log/BUILD.gn

@@ -31,6 +31,18 @@ if (defined(ohos_lite)) {
   }
 } else {
   import("//build/ohos.gni")
+
+  #
+  # exported include directories
+  #
+  config("init_log_exported_config") {
+    visibility = [ ":*" ]
+    include_dirs = [
+      ".",
+      "//base/startup/init_lite/interfaces/innerkits/include",
+    ]
+  }
+
   ohos_static_library("init_log") {
     sources = [ "init_log.c" ]
     defines = [ "INIT_DMESG" ]
@@ -38,6 +50,7 @@ if (defined(ohos_lite)) {
       "//base/startup/init_lite/interfaces/innerkits/include",
       "//third_party/bounds_checking_function/include",
     ]
+    public_configs = [ ":init_log_exported_config" ]
     part_name = "startup"
     subsystem_name = "startup"
   }
@@ -58,6 +71,7 @@ if (defined(ohos_lite)) {
       "system",
       "updater",
     ]
+    public_configs = [ ":init_log_exported_config" ]
     external_deps = [ "hilog_native:libhilog_base" ]
     install_enable = true
     part_name = "init"

services/utils/BUILD.gn

@@ -30,6 +30,11 @@ if (defined(ohos_lite)) {
 } else {
   import("//build/ohos.gni")
 
+  config("init_utils_exported_configs") {
+    visibility = [ ":*" ]
+    include_dirs = [ "//base/startup/init_lite/services/include" ]
+  }
+
   ohos_static_library("libinit_tools") {
     sources = [
       "//base/startup/init_lite/services/utils/init_hashmap.c",
@@ -42,6 +47,7 @@ if (defined(ohos_lite)) {
       "//base/startup/init_lite/interfaces/innerkits/include",
       "//base/startup/init_lite/services/include",
     ]
+    public_configs = [ ":init_utils_exported_configs" ]
     defines = [ "_GNU_SOURCE" ]
     part_name = "init"
   }
@@ -55,6 +61,7 @@ if (defined(ohos_lite)) {
       "//base/startup/init_lite/interfaces/innerkits/include",
       "//base/startup/init_lite/services/include",
     ]
+    public_configs = [ ":init_utils_exported_configs" ]
     defines = [ "_GNU_SOURCE" ]
     part_name = "init"
   }

ueventd/BUILD.gn

@@ -96,6 +96,13 @@ if (defined(ohos_lite)) {
     ]
   }
 
+  #
+  # exported include directories
+  #
+  config("libueventd_exported_config") {
+    visibility = [ ":*" ]
+    include_dirs = [ "./include" ]
+  }
   ohos_static_library("libueventd_ramdisk_static") {
     sources = service_ueventd_sources
     include_dirs = service_ueventd_include
@@ -107,6 +114,8 @@ if (defined(ohos_lite)) {
       external_deps = [ "selinux:librestorecon" ]
       cflags += [ "-DWITH_SELINUX" ]
     }
+
+    public_configs = [ ":libueventd_exported_config" ]
     part_name = "init"
   }